GE T35 - Page 408

5-206 T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS CHAPTER 5: SETTINGS
5
XFMR HST PICKUP — Enter the hottest-spot temperature required for operation of the element. Base this setting on the
maximum permissible hottest-spot temperature under emergency transformer loading conditions and maximum ambient
temperature.
XFMR HST DELAY — Enter an appropriate time delay before operation of the element.
Figure 5-105: Transformer hottest-spot temperature logic
5.7.3.5 Aging factor
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  TRANSFORMER  AGING FACTOR
The Aging Factor element detects transformer aging in per-unit normal insulation aging. The element can be set to alarm
or trip whenever the computed aging factor is greater than the user-defined pickup setting for the specified time delay.
AGING FACTOR PICKUP — Enter a value above which the aging factor element is to operate. Enter a setting greater than the
maximum permissible aging factor under emergency loading conditions and maximum ambient temperature.
 AGING FACTOR


AGING FACTOR
FUNCTION: Disabled
Range: Disabled, Enabled

AGING FACTOR PICKUP:
2.0 pu
Range: 1.1 to 10.0 pu in steps of 0.1

AGING FACTOR
DELAY: 10 min.
Range: 0 to 30000 min. in steps of 1

AGING FACTOR BLOCK:
Off
Range: FlexLogic operand

AGING FACTOR TARGET:
Self-Reset
Range: Self-reset, Latched, Disabled